Ore-pulverizer



' ZSheets-Sheet 1.

(No Model.)

B. O. GRIFFIN.

ORB PULVERIZER.

No. 351,321. Patented Oct. 19, 1886.

jizverazar, Elm/ b @1999.

2 Sheets-Sheet 2.

(No Model.)

B. 0. GRIFFIN.

ORE PULVERIZBR.

No. 351,321. Patented Oct. 19, 1886.

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N. Psicns. Finale-Lithographer. Washington. D. c.

UNITED STATES PATENT EEicE.

EDXVIN O. GRIFFIN, OF BROOKLYN, NEW YORK.

ORE-PULVERIZER.

SPECIFICATION forming part of Letters Patent No. 351,321, dated October 19, 1886.

Application filed March 29, 1886.

To all whom it may concern.-

Be it known that I, EDWIN CoLvER GRIF- FIN, a citizen of the Dominion of Canada, residing at the city of Brooklyn, in the county of Kings, State of New York, have invented certain new anduseful Improvements in Ore- Pulverizers, of which the following isaspeoification, reference being had therein to the ac companying drawings.

My invention relates to that class of millsin which the reduction or pulverization of ores and other substances is accomplished by the revolution of one or more rollers within and against the inner wall of a ring or die, said rollers being held in contact with said die by centrifugal force.

The object of my invention is to produce a mill in which ores and other substances, however refractory and of whatever degree of hardness, may be rapidly and cheaply pulverized and reduced to an impalpable powder.

I am aware that others have attempted to accomplish the same results, but, so far as I know, with only partial success. Their failure has been due to the defective means used to secure the desired ends, resulting in great loss of power and excessive wear of the mills.

I have succeeded in overcoming the difficulties heretofore experienced in the particulars named,and effected the easy and ready adj ustment of the parts by which the work is performed, so that I produce a mill which not only performs its work rapidly and cheaply, but is readily understood, easily managed, and comparatively inexpensivein its manufacture.

The essential feature of my invention consists in the means and mechanism employed, by which the pulverizing-rollers are held in position and caused to rotate against the inner wall of the die by centrifugal force without supports from above or below. By doing away with such supports and causing the rollers to support themselves in place with only slight guidance and control, while at the same time accomplishing the same or better results in pulverizing than have been secured in other mills, I have succeeded in overcoming the excessive wear in the mills and at the same time largely saved the power heretofore lost therein.

In the accompanying drawings I have illus Serial No. 106,981. (No model.)

trated the form of mill, with its parts, which I prefer to use, as Well as some modifications thereof; but I do not limit myself to the forms there shown, as it is evident that other modifications of the mill and of its parts may be made without departing from the nature and character of my invention.

In said drawings, Figure 1 represents a side elevation of the mill with a portion of the pan, cover, and die broken away, showing the rollers in operative position, and the semicircular pockets in the carrier having inclined bottoms. Fig. 2 is a plan view of the mill with a portion of the cover removed, showing a partial plan view of the interior of the mill, the arrangement of the die, the rollers, the adjustable swinging arms on which the rollers are journaled, the tie-links, and feed plate. Fig. 3 is a vertical section through the cent-er of the mill. Fig. 4 is a broken plan view of the mill, with the cover removed, showing a modification of the means for sustaining the rollers, of which Fig. 5 is a partial elevation.

In the drawings, p represents the circular shell or casing inclosing the die and the operative mechanism, having openings 0 0" in its bottom, near the center, for the admission of air. Within this casing a circular die, (I, is placed,of such diameter as to be easily secured in place by the packing f. This die rests upon pads e e,of wood, rubber, or other suitable elastic material placed within the casing, as shown. A ring, h, bolted to the top of the pan p,secures the die (Z in its place, the space between it and the die being packed with some elastic material. Direct contact between the pan and die is thus prevented, and the objectionable jarring and noise incidental to this class of mills are greatly reduced.

The mill is provided with a cover or housing, j, having an exhaustpipe, 0, opening into it on the top, and into this pipe opens a pipe, 9, closed by a swinging gate, 9, so as to prevent the escape of dust into the hopper. Through the center of the pan 1) is journaled a shaft, Z, driveu'by any suitable power connections. To-the top of the shaft Z a rotating carrier, I), is rigidly secured. This carrier is provided with semicircular pockets 11 in which the rollers r r freely rotate. The bottoms of Said pockets are inclined, as shown at 3 f, and

' head it by set-screw a may be cast integral with the carrier or bebolted thereto. An open space or mouth is provided at the lower edge of each bottom, thus permitting the ore to be caught on said bottom and scooped or carried up to the roller again by the revolution of the carrier.

Swinging arms 2- t, having rollers journaled in the heads thereof, are secured to the carrier at m m. The arms t t have hollow heads t t, and downwardly-projecting sleeves therefrom to receive the spindles a and their surrounding core E. (See left-hand part, Fig. 3.) The heads of the arms it are secured to the lugs b of the hub of the carrier 1) by adjustable links o a. Each spindle a. is rigidly secured in the Surrounding the lower end of each spindle a is a hollow core, t

This core 2& fits loosely over said spindle afland may be easily removed therefrom, the core revolving thereon. To this core 16 is rigidly secured a roller, 1-, which rotates in the pocket 1), formed in the periphery of the carrier 1) and against the inner wall of the die (1. r In the heads of the arms t t oil-cups s s are formed, having suitable caps secured by set-screws. An aperture, to, is bored part way down each spindle a from which aperture openings extend to its sides. By putting oil in said cups the parts are readily lubricated. It will thus be seen that the rollers r 1 may rotate freely in the pockets b, formed in the periphery of the carrier 1), and against the inner wall of the die d when said carrier 12 is revolved. Said rollers being loosely secured to the spindles a by the cores 15 may, when in operation, have a vertical movement sufiicient to bring their peripheries against the entire depth of the wall of the died. The arms tt are loosely secured to the carrier b, so that they may swing out and in and up, and down as 'the'rollers r r are carried out and in and up and'down by the centrifugal force imparted from the revolution of the carrienb.

The heads t t of the arms 15 it may be so adjusted by the links 11 1; that when in operation the axes of the rollers w" and their spindles a 0: will correspond with the central axis of the carrier 12, around which they revolve. In this way all friction of the parts is overcome, as there is no binding, the rollers moving freely on their spindles andagaiust the die, being supported in their position by centrifugal force alone.

When the mill is not in operation, the rollers r 1* fall down out of contact with the wall of the die (1, and the projecting ends of the cores t rest upon the inclined bottoms y of the pockets 1)". 1

On the right-hand side of Fig. 2 I have shown another way of securing and arranging the spindles in the heads of the arms, and of securing the rollers r r to said spindles. In this case the rollers r 1' are rigidly secured to the spindles a, and the spindles rotate in the b apertures or bores formed in the heads of the,

arms. In Fig. 5 I haveshown another way of securing the rollers r 1' to the swinging arms. In this case each spindle is rigidly secured at its opposite ends to said arm, which is in two parts, and the roller'rotates upon such spindle.

The operation of this mill in dry grinding is as follows: The carrier and feed-distributer b throws-the material dropped upon it from the feed-pipe g outwardly between the pockets I), upon and against the inner wall of the die 01, where the rollers r r crush it by centrifugal impact. As fast as the material is thoroughly pulverized it is carried up and out 'of the exhaust-pipe c by the current of air produced by the revolving of the carrier b, or by an exhaust-fan attached to said pipe 0. The mate-- rial remaining unpulverized falls down into the pan, is caught up by the inclined bottoms y y of the pockets 1), and again forced betweenthe rollers and the die with incoming material until it is pulverized and carried off, as above stated.

For wet grinding, screens (not shown) are put 'into the cover j, just above the ring h, and the openings o o, for the ingress of air, are closed by any suitable means, the water being introduced with the material, or in any other suitable manner. In this case the water and fully-pulverized material pass out through the screens, and are carried ofi' to a receptacle by a trough or other suitable conveyer. The fineness of the material will be determined by the strength of the current of air, or the mesh of the screen, or both, as the case may be.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In an ore-pulverizer, the combination of a circular die, a carrier mounted Within the same, and formed with semicircular pockets in its periphery, arms secured to said carrier," and rollers fitting and rotating in said pockets and against. the inner wall of said die by centrifugal force, substantially as described.

2. In an ore-pulverizer, the combination of a circular die, a carrier mounted within the same, adjustable guiding-arms secured to said carrier and having spindles projecting from the free ends thereof, and rollers j ournaled on said spindles, carrying said guiding-arms, and rotating against said die by centrifugal force, substantially as described.

3. In an ore-pulverizer, the combination of a circular die, a disk-carrier mounted within the same and having semicircular pockets in its periphery, provided with inclined bottoms open at their lower edges, and forming scoops, adjustable guiding-arms secured to said carrier at both ends, and having spindles projecting from the loose ends, and rollers j ournaled on said spindles, carrying said guiding-arms, and rotating against the die by centrifugal force, substantially as described.

4. I11 an ore-pulverizer, the combination of an inclosing-shell provided with a hopper and an exhaust-pipe, a circular die, a disk-carrier, adjustable arms secured to said carrier, rollers IIR journaled on said arms and rotating against In testimony whereoflaffix my signature in 10 said die by centrifugal force, and an operatpresence of two Witnesses. ing-shaft, substantially as described.

5. In an ore-pulverizer, the combination of EDWIN O. GRIFFIN. 5 an arm having a hollow head in the form of a downwardly-projecting hood, a spindle se- \Vitnesses: cured to said head, a hollow core, and a roller, JAMES K. GRIFFIN, constructed and arranged substantially as de- ALICE E. GRIFFIN. scribed. 

